Radio apparatus



h gy 20, 1939. D.- F. AsBuRY RADIO APPARATUS I Original ljiled Dec. 31, 194225 2 Sheets-Sheet l @gy gij@ D. F. AsBURY i May 20, 1930,

RADIO gna/mus Original Fl'iledD'ec. 3l', 192.3 2'Sheets-Sheet- 2 I. i @www place an ap q in'ent of ,eachfunit to tune the ,set with each of the tuning memset/ny zo, 193e -uNi'raDl 's'rA-Tas- PATENT- orifice nonsnY nAsBUn'Y, on Bnoomns ISLAND, italianmix) RADIO APPARATUS Application led December 31, 1923, Serial 110,683,756. Renewed October'423, 1929.

My invention relates to radio apparatus, particularly receiving sets, employing plural tuning units, and 'my purpose is to provide means to. elifect adjustments of all tuning units of an apparatus simultaneously to correet relative relation for any particular Wave length, to the end 'of rendering it possible to aratus as an entirety in tune withaninfinite number of wave len thsin an exceedingly short space/'of time, anr to assure 'tuning of an apparatus withl all wave lengths within its capacity upon simultaneous movement of all of its tuning units from one extiemeadjustment thereto to the other.

So far as I am aware, in all radio receiv ing sets employing a plurality of tuning un'its, it is necessary to` make a separate adjustdifferent wavelength, which means, of course, that if the receiving sst employs,'say, three timing units, two-hundred and twenty-five' adjustments arefnecessary, to tune the setwith seventyfive different wave len ths, this being true rovided the correct. a )ust/ment of .each tuninv unit for la given wave-length lknown. On. the other hand, if

is previously the correct adjustment of the ituning units for a given wave length -is unknown, the number of adjustments necessary to secure tuning of the set'with that o'r any particular 'wave length might be infinite. Again, lassumim1r that only one Awave len th was bein further assuming that the correct adjustment unitswas known for eachwave length, it is manifest that seventy-fourof the known ad 'ustments mig tbe made before the correct a justment final ywas made tuning the apparatus withthe single wave length being broadcasted.

By the use ot'my invention all of .the disadvantages inherent to the foregoing are eliminated, for by moving the tuning units simultaneously from one extreme adjustment to the other and constantly maintaining u. correct timing relation between them the apiaratus is of necessity tuned with each wave length being-broadcasted whether the correct adjustment of the tuning units for any or all wave lengths' is or is'not known.

broadZ castc'd out of a possi le seventyve, and- My inventive idea, which finds expression solely in mechanical means, as distinguished from radiant energy or any theory with re' spect thereto, iscapable of embodiment in-l dierent mechanical structures, certain of which are specifically shown in the accom. panyin'g drawings, but it is to be understood".V

that the structures shown are merely intended as disclosures of the essential `features and novel characteristics ofiny invention in prereference denote corresponding parts' in the G5 di tl'ei'ent' views Figure 1 -is a front elevation of a radio ijeoeivingset equipped with my invention;

Fig; 2, a top planshowing the essential parts of the receiving. set shown in Figure 1 10 with my invention applied thereto;

A- Fi". 3, a transverse section on the line 3-3 of Figure -1;

Figure 4, a-detail'perspective showing a referred arrangement of maintaining a reeasable 1 driving 'connection between an operator and a movable part of a'tuning unit;

and

' Fi 5, a diagrammatic. view ofa slightly modi ed arrangementfor operating a, `plurality of tuning units by a common o Aerator.

In the drawings I have shown my i vention applied to avwell known commercial type of radio receiving set consisting of a panelboard 10 through which extend three parallel spaced 85 shafts 11, 12 and-13 having fixed thereto, respectively, at their ends outwardly of the panel board dials 14, 15 and 16 for rotating said shafts to angularly adjust the movable parts of Vtuning units 17 418 and 19, that are 90 carried by them inwardly of the panel board. The tuning units referred to will, f counse, vary in different types ofireceivng sets, and

in certain instances they may not all be of the 5' l sameor like character, for in one instance they. may nonsis't of variable plate condensers in association either .with or without other devices, such as coils, and in another instance they may consist of coils, known in 100.

18 with that wave length, and dial 16 mustv also be rotated say 10 to correctly time unitl In other Wordslk of a receiving set in these particulars being immaterial to the operation of my invention so long as the movable parts of the respective `tuning units have a predetermined adjustable relation with respect to each other.

In the particular` receiving set herein illustrated the tuning units 1-7, 18 and 19 are of like character, each including'essentially a variable plate condenser consisting of *a stator a and a rotor b as shownin detail in the trans verse section, Figj, which is an illustration ot unit 18- As aforementioned, the4 rotors a of the three timing unit-s shown are moiin'tedfor rotation with the shafts 11, 12 and 13 and dials 14, 15 and 16 respectively, and'thu's it is apparent that byrotating the respective dialsth'e movable parts of the different tuning units may be adjusted-'to tun'ethe different units with different wave lengths, l

My invention is based on the observation that in certain types of receiving sets employiiiy plural tunin g units the ratio of movement of the movable. parts ofthe different tuning units i-n changing the adjustment of thelatter to tnneth'e same ,ivith'diierent Wave lengths,

is fixed, by which I mean that Vto time the receiving set 'herein illustrated for inst-ance, a rotary movement of say 10 of dial 14 from a. given starting pointrto tune the unit 17 With a particular Wave length means that dial 15.

must be rotated say 14 to correctly tune unit 19 with that wave length. once a correct adjustment of all tuning units is knoiyn for any particular wave length, the necessary adjusting movement of the. tuning units with respect to eachother tocoi'rectly tunetall of them with any other Wave length is predetermined and remains fixed.

In the receiving set hereinillustrated, the

amount of rotation required of dials 14 and 16 from a given stai-tin(r point to correctly.

,tune the two tuning units associated therewith with a' giVenWaVe length is the same, and this is true also of dial 15 and its tuning unit within certain predetermined limits of its adjustable movement, but within other predetermined limits the amount of adjustment required of dial '15 to "tune its tuning unit i'vith the same wave length varies with respect to the adjustment required ofthe remaining units. lIn other words in the particular arrangement herein shown the 'angular velocity of dials 14 and 16 in moving their associated-tuning units from a position .in tune with one wave length to a position in tune with another waver ength is always the same, Whereas within certain predetermined limits, the angular velocity of dial'l in so moving its associated tuning unit varies.

@stated another way, it is iiecessaryat predetermined times to either speed-up or re. duce the movement of the movable part of oneor more or even all ofthe timing units with respect to one another in order to cause all of them to time with thesame wave length sin'uiltaneously.

In 'accordance with the foregoing I have provided'means for adjusting all of the tuning unitssimultaneously so as to cause each unitito tune with a given Wave length at the same instant, and also I haie provided in combination with said means other means whereby an individual Vernier adjustment of the different tuning units may ,be made, so 'that if needjbe minor correction may be made in the adjustment of any one or more of the tuning units to secure an absolutely correct final adjustment after they have been initially simultaneously adjusted.

i On shafts 11, 12 and 13, between the panel board 10 and the respective dials 14, 15 and 161that are, as aforesaid, fixed to said-shafts, 'I loosely mount three disks 20, 21 and 22, one on each shaft, andin each disk I form a slot 23, While in each dial I rotatably mount a shaft 24, the inner end of which carries .an 'eccentric25 operating in its related slot 23 an adjusting knob 26. Thus, by holding any given diskagainst rotation and turning the knob 26 to rotate the eccentric in association' with that disk, rotation of the dial carrying that particulareccentric and consequent vernier adjustment of the tuning. unit in asso ciatiori Withthat particular dial lWill be effected.

My means for adjusting all of the timing units'simultaneously consists lof an operator in the form of a light, flexible liar or rod 2T .arranged in frictional driving contact with the peri heries of t-lie disks 20, 21 and 22, so that by., odily shifting said operator longitudinally as, ifo'r instance, by means of a suitable knob or hand grip device 28 thereon, each of said disks will be rotated and, because of the aforementioned Vernier connections between the respective disks and dials, the latter Will be rotated and with them the shafts 11, 12 and 13, as Well as tliemovable parts of the tuning units carried thereby. Disks 20, 22 in the receiving set herein shown are of the same diameter and consequently when the bar`27 is shifted, the same amount of rotation is imparted to each of them. Disk 21, however, is el'iordally cut away as at 29 and bar y:is

' ripheral on operato 2',` shifting tune withn given wave length at substantially the same-instantihatuthe tuningA units associatedwith disks 20, 22 tune' therewith.

- The chordal cut-away portion'4 29 ofdisk .and offset 30 Aon operator 27 provides, of

`course, for increasing the s eed of rotation of saiddisk with res ectto disks 20,22 within the limits yof sai cutaway. portion upon shifting of said operator. ever, it might be' necessary to reduce the speed of disk 21 at predetermined times with respect -to disks 20, 22, which could be accomplished by reversing the arang'ge'zrnentshowm-or in other words, 'providing 'an 'enlargement on f, the disk and a recess in the operator'. It fol'- lows alsothat in instances where itisnecessary, the rotation of two or moredisks may be reduced or increased yvithsresp'ect to each other or with respect toanotherldisk'in the same manner. Furthermore, anyone orv all of the disks mayzhave plural reduced or enlarged ortions as indicated by the -full 'and dotted ineson disk 22, so that' at one time the speed of rotation of a disk ,or disks may be increasedandat another time reduced..

Operator 27 isutilized not only to simultaneously rotate the. disks 20, 21 and 22, but

g also to holdsaid disks against rotation when Vernier adjustments are beingeffected'rasV aforementioned, andin order tohold 'said' operator against the disks, so that it willl drivel them and also so that they will be held associated disk 20. 2l 0I' against, rotation by one another during' individua'l Vernier.y ed]ustm ents -of the timingunits,-I have provided a pluralitylof 'pressure devices, one inl association with each disk,.and as shown eachj of 'said pressure devices con- -sists of *aV pairlof arms 31, 32, the formiern'o'f which is pivoted atene end to the panel board 10,r as at 33, and'terininatesat its free lendV` adjacentto the 'free end of arm 32, which latteris connected at its other end toits asso` ciated shaft 11, 1 2 or 13 as 'the case maybeQA The f reeendofl arm 32 is bent to overlie arm: 31 and a pin 34 extends from arm 32 througharm 31 to maintain ythe free lends of saidarms p in proper relative'relation, while surround# in'g said pin is an expansioncoil springf35 that reacts from arm32 andas a consequence from the associated shaft 11, 12 or 13, against arm 3 1 to maintain a roller 36 that is carried by the lutter arm, pressed against bar 27 and said bar pressed against the periphery of the ency 4tochange the. correct relation Obviously, hows'l -res ect to these parts.

. 27 adaptingitself to the 22 in 'frictional driv` ling contact therewith. By thus causing 4the pressures that hold the bar 27 in Contact with the disksE the disksV arel mounted, -all strains on. said shafts which mightotherwise have a tendof the blades of the rotary and stationary psarts of the variable condensers are avoided.

y such` toreact from the shafts on which 4 an arrangement. it is manifest also that'the respective pressure devicesmay be released selectively to permiteach dial to-be ad]usted independently ofthe other dials.

A knob 37 maybe rovided onone or more of the rollers 36, so t at said -roller or rollers may be utilized as a ve'i'nier or verniers for shifting the operator'27, and the latter, ifdes`ired,vroughened or may be faced with e'mery cloth or other suitable friction material 38 forcontact with the peripheries of the disks and rollers toavoids i n the-modification'sliown linfFig. 5, the operator27 is inthe nature o diameters and, if desired, of irregular shape so' thatu on shifting of said operator each disk will e rotated a correct amount, the rod different size disks and. to irrgularities inthe peripher' `.s there.- of'asis apparent.'

.1'.- In radio-apparatus, a rotatable shaft, a tuninfi unit a part of which is movable with saidShaft, a member on said shaft, an operator engaging saidmember, apivoted arm, a roller carried .by-said arm engaoung said operator for driving thelatter, and me ans reactin" from vsaid shaft-'against saidarm to hold said roller in? engagement with 'said operator. 2. In radio apparatus,.a rotatable shaft, a tuninf` unit Va part of which is movable with said shaft, a member on said shaft, an operator engaging said-member, a roller engaging said operator, and yieldable means. reacting :from said\',sh aft against said operator through said rollert/eA hold said .operator in engage-l mentgwith said member.-v

pp age of said bar with a flexible rodand thedisks 20,.21 and 22nd-of different ies 3.'- In-rad'o apparatus, a rotatable shaft, a

tuning unit lafparthot which is movable with said shaft, a member on said shaft', an operato'r e`ng'aging said member, a pivoted arm, a roller carried by said arm and engaging said "operator, a second arm .connected at one end to said shaft and terminating at its other end ladjacent to said first mentioned arm, and a springb'etween' said'rst and last mentioned arms Areacting from the' latter* against the formerlto hold said roller` in engagement with said'operator and the latter in engagement with the member on said shaft.v

4. In radio apparatus, a plurality of tuning unitsa part of 'each of which ismovable, a membercominon to a pluralityof said' movable parts for moving them collectively,

means to im art line adjustments tosaid member there y to impart fine adjustments to said movable parts collectivel and a separate means carried by and movablevvith each in'ovahle part for imparting fine adjustments to said movable parts indiwclually'.

5. In radio apparatus. tuning unit, a part of which is movable, a lneally reciprc'al op' erator in rolling' driving contact with said movable part` contacting portions o-f said operatoraml said movable part being of irregular fciin whereby said movable part is moved at varying velocities during movement of sziidopcraor a't a constant velocity.A

Iiiradio apparatus a timing unit including a member to be driven, a lineally'recipria-,al driving member in rolling driving contact. with said member to be driven, a portion of one of said members which contacts with the other member being ofirregular,

forni whereby said driven member is moved :i t varying velocities duringmovement of said driving member at a constant velocity.

7. In radio' apparatus, a-rotatable shaft, a

tiininfr iiriit a part of wliicli'is movable with said sliaft, a member on said shaft,-an operator engaging said member, a' roller' engaging said operator, and yieldable lmeans acting against said roller to hold said operator insaid shaft, a member on said shaft, an oper-f ator engaging said member, a pivoted arm,a. member carried by said arm engaging said operator for driving the latter,V and means re lacting from said shaft against said arm to hold the member carried thereby in engage' ment with said operator. L 10. In radio-apparatus, a rotatable shaft, a timing unit a part of which is movable v'with said shaft, a member on said shaft, a reciprocal operator in driving engagement Withsaid member, a pivoted arm, a roller'carried. by said arm engaging saidoperator, and means reacting from said shaft against said arm. to

hold said'roller in engagement with said o erator and the lat/ter in engagement withsaid member. Y

11. In radio apparatus,.a tuning unit a'part of which lis movable, a Iineally reciprocal operator in rolling driving engagement with an element of said timing unit for moving the movable part thereof, and means forhvarying the velocity of said movable part' during niovenient of said operator at a constant vevrotata le parts mova c .12. In radio' apparatus, a pair of tuning units a part of each of which is rotatable, a lineall reciprocal ioperatorcommon to said le to rotate them collectively, said operator being in rolling contact with said rotatable parts, and means whereby said rotatable parts may be rotated at constant and'also at variable velocities with respect to one another during movement of said operator at a constant velocity.

13. In radio apparatus, a rotatable shait,

a timing unit a part of which is movable with said shaft, a bearing for said shaft, a member on said shaft, an operator in driving engage- -mcnt with said member, and lyieldable means exclusive of said beari'iig'reacting'from said shaft to Vhold said operator in driving en gagement with said member whereby said bearing is relieved of the .force ofsaid yieldable means.

14. In. radio apparatus, a timing -unit a part of wliichis movable, a pair of members one of whi'cliis loose and the other fixed with respect to said movable part, and an eccentric .carried by the member that is'lired with respect tosaid movable part operating in a slot in the member that is loose with respect to said movable part.

'In radio apparatus, more than'two tuning units, a at of eachy of which is movable, connections lietweenthe movable parts of the units to collectively secure adjustments of the units, and means include-d in said'connections and carried by the movable'part of atleast one of the units, said means being operable to efect'individua'l adjustment of the movable part of its related unit.

16. In radio apparatus, more than two tuning units, a part of each of which is movable, connections between the movable parts of tbe units to collectively secure adjustments of the units, and meansincluded in said' connections and carried by the movable part of at least lone of the units, said means being selectively operable to effect either individual adpistv ment of the movable part of its relatedunit or collective adjustments of the movable parts ofall the units.

17. In radio apparatus, more than two tun- 'ing units, apart of each of which is movable,V

connections between tlie'movableparts of the units to collectively secure adjustments ot the units, an'd means included in said connections and carried by the movable .part of at least oneof the units, said means being operable to effect individual adjustment of the movable part of its related unit, and'also operable, 'when the movable part of its related unit is held against adjustment, to collectively A adjust the movable parts of the remaining units. L A

18. In radio apparatus, a. tuning unit a portion of which is movable, a member adapted for movement relatively to the movable porti'nn nf the unit.. and nn eccentric device n0r lflO portion of'the unit.

In testimony whereof 'I .hereunto ax'my signature;

DORSEY F. ASBURY. 

